Just recently (a whole 2 days after the warranty expired) my Nav screen completed blacked out along with radio. Checked the fuse box and sure if enough I'd blown a fuse. I thought, simple fix and replaced the fuse with a 30 amp that was in its' place and not even a whole day later the Nav screen went out again...Thought I'd give it another shot with a 20 amp, turned the ignition and all of a sudden this really loud humming/buzzing was coming from the speakers :confused3 I immediately turned the ignition off, removed the 20 amp and tried the 30 amp and the same buzzing occured...Any suggestions or similar occurances from anyone? I'm out of ideas...Thanks all :cheers: